Daikin UATYA-B, Руководство по эксплуатации

Страница: 77 / 126

77
Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
Parameter Min Max UM Description
STH119 0.0 100.0 % Auxiliary heating - Winter oper. - PID - Max. output
STH123 -100.0 100.0 °C Auxiliary heating - Deactivation threshold for low external air temperature
STH124 -100.0 100.0 °C Auxiliary heating - Deactivation threshold for high external air temperature
STH126 0 100 %
Mechanical heating with auxiliary heating - Percentage threshold of priority
source demand for second source activation
STH127 0 999 s
Mechanical heating with auxiliary heating - Delay in demand activation from
lower priority source
STH128 0 999 s
Mechanical heating with auxiliary heating - Delay in demand de-activation
from lower priority source since min. value achieved
STH129 0 2 - Mechanical heating with auxiliary heating - Priority
STH130 0 2 - Auxiliary heating - Heating devices - Priority
STH132 0 100 %
Mechanical heating with auxiliary heating - Demand for auxiliary heating
during defrosting (0 = Disabled)
STH133 0 100 %
Mechanical heating with auxiliary heating - Percentage threshold of second
source demand for de-activation
STH136 -30.0 10.0 °C
Auxiliary heating - Anti-freeze function - External air temperature threshold
for activation
STH137 0 100 %
Auxiliary heating - Anti-freeze function - Percentage demand with function
active
STH138 0 100 % Auxiliary heating - Hot water valve - Min. opening
STH139 0 100 % Auxiliary heating - Hot water valve - Max. opening
STH140 0 999 s Auxiliary heating - Delay in OK signal to pump
3.16.1 Controlled devices
The controller controls the devices installed in the unit, which may include:
- electrical heaters, divided by either one or two power steps;
- a hot water coil with an analogue signal to control opening of a valve and a digital OK signal to control a pump that gets
started with the delay value set in parameter “STH140”. This management logic includes the anti-freeze function;
- a boiler that is controlled by an analogue signal and a digital OK signal which gets enabled as soon as an analogue
demand is received. This management logic includes a digital input through which the controller receives alarms from
the boiler, if any, as well as an anti-freeze function;
- a burner that is controlled by an analogue signal and a digital OK signal which gets enabled as soon as an analogue
demand is received. This management logic includes a digital input through which the controller receives alarms from
the burner, if any.
Parameter “STH55” is used to enable auxiliary heating for:
- summer operation only, in which case it serves as post heating during the dehumidification cycle;
- winter operation only, in which case it serves either as single source, if the refrigerant circuit does not feature cycle
reversal, or as an integration to heating where the latter is implemented by the refrigerant circuit;
- both summer and winter operation.
Anti-freeze function
The anti-freeze function, which is included in versions featuring a hot water coil and a boiler, is enabled when the unit is in
operation, no heating demand is present and the external air temperature is lower than the setpoint in parameter “STH136”.
In versions with a hot water coil, when the anti-freeze function gets enabled, the controller opens the relevant control valve
at the value set in parameter “STH137” and it enables the circulation pump.
The circulation pump gets activated after the delay in valve opening, as set in parameter “STH140”.
In versions with a boiler, when the anti-freeze function gets enabled, the controller outputs to the boiler the demand signal
as set in parameter “STH137” and an OK signal for activation.
The anti-freeze function is disabled when the outside air temperature has exceeded the value set in parameter “STH136”
by 1 °C.
3 Software functions